Why F1 Banned The 6 Wheeled Car?

In 1975, a British engineer found a loophole in the Formula One rulebook that nobody had ever thought to look for. He built a car around it in secret. It won a Grand Prix. Then F1 banned it.

This is the story of the Tyrrell P34, the only six-wheeled car to ever win a Formula One race, why it worked, and why the real reason it got banned has nothing to do with safety.